Back-pressure valve.



PATENTED APR. 5, 1904.

H. J. WESSINGER.

BACK PRESSURE VALVE.

APPLICATION FILED SEPT. 4, 1903.

2 SHEBTS-SHEET 1.

K0 MODEL.

2m 00.; mum um PATENTED APR. 5, 1904-.

H. J. WESSINGER.

BACK PRESSURE VALVE.

APPLICATION FILED SEPT. 4, 1903.

N0 MODEL.

2 SHEETS-SHEET 2.

Wfiesses:

9V yaw/$411711.

films UNrrEn STATES Ill Patented April 5, 1904.

PATENT OEErcE.

HENRY J. "ESSINGER, OF DULUTH, MINNESOTA.

BACK-PRESSURE VALVE.

dated April 5, 1904.

(No model.)

To all 7117mm, it may concern:

Be it known that I, HENRY J. EssINeER, a citizen of the United States,residing atDuluth, in the county of St. Louis and State of Minnesota,have invented certain new and useful Improvements in Back-PressureValves; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to back pressure valves, and has for its object theconstruction of a valve adapted to retard the escape of exhaust-steamfrom engine-cylinders.

It consists, in combination with a casing divided into a suitable seriesof connecting-chambers, of cradle-valves mounted in the central chamberand pistons contained in the other said chambers and respectivelyconnected with said cradle-valves to operate the same.

It also consists of certain other constructions, combinations, andarrangements of parts, as will be hereinafter described and claimed.

In the drawings, Figure 1 is a side elevation of my said invention,partly broken away and partly in vertical longitudinal section in twoplanes, on the line at m g z of Fig. 3. Fig. 2 is a perspective View ofone of the cradlevalves. Fig. 3 is a horizontal mid-section of my saidinvention, and Fig. 4 is a vertical transverse section of the same.

In the drawings, 1 is a casing containing a central chamber 2, providedwith covers 3 and 4. Said covers contain piston-chambers 5 and 6,respectively, which communicate with said central chamber through ports7 and 8.

Within the chamber-2 is constructed a horizontally-arranged grating 9,the openings or ports 10 in which are adapted to be normally closed bysuperimposed cradle-valves substantially of the pattern shown in saidFig. 2 and comprising a plural number of port-covering bars 11, formedon and extending between end disks 12 and 13, respectively, upon thedisk 12 of each of which valves is formed or secured a pin 14. Each ofsaid chambers 5 and 6 is adapted to contain a piston 15, which pistonsare centrally reduced, as at 16, to form a bearing for loose gibs 17.The opposite walls of said central chamber are apertured to receive thedisk portions 12 and 13, respectively, of each of said cradle-valves,said walls forming bearings for said valves. The end covers forming partof said casing are also apertured, as at 18, to permit the passage andoscillation of the pin 14, which projects therethrough and engages anaperture formed in said gib 17 Said cradle-valves are inserted in saidcentral chamber before the end covers of the casing are attached, andalso prior to the attachment of said covers said pistons are insertedinto the chambers 5 and 6, respectively, through openings in tops ofsaid chambers, which openings are then preferably closed by suitablescrewplugs 19. The pins 14 are then brought into registration andengagement with the apertures of the respective gibs, and the covers arebolted to the central casing. Said cradle-valves are of one pattern andin position lie parallel to each other in opposite directions and rockoppositely. In operation when exhaust-steam conducted by any suitablemeans flows into said central chamber from the direction indicated bythe arrow A it is at first prevented by the grating and cradle-valvesfrom directly tra'versing the central chamber, and therefore passesthrough the ports 8 into the chambers 5 and 6 beneath the pistons,forcing said pistons upward. The movements of said pistons rock therespective cradle-valves, which thereupon uncover the ports through saidgrating and permit the exhaust-steam to directly traverse said centralchamber and escape in the direction of the arrow B. The pressure beingrelieved from beneath said pistons, they fall of their own weight,returning said cradlevalves to normal position. Compression of air orsteam above said pistons is avoided by means of said ports 7.

While I have described a certain embodiment of my invention, it isobvious that within the scope of said said valves may be increased ormay be diminished to one cradle-valve and one piston and minor changeseffected in the construction and contours of said valves, grating, andother parts.

invention the number of Having now described my invention, what I claim,and desire to secure by Letters Patent, is-

1. In a back-pressure valve, the combination of a casing comprising acentral chamber, open at each end, having a grating formed. therein, andside chambers communicating with said central chamber through suitableports, pistons inclosed in said side chambers, cradle-valves mounted insaid central chamber and adapted to govern the ports through saidgrating and provided with means for engaging said pistons, substantiallyas described.

2. In a back-pressure valve, the combination with a casing have acradle-valve chamber open at the top and bottom and a pistonchamberformed therein communicating with each other by means of ports andhaving a grating formed within and horizontally dividing saidcradle-valve chamber, of a piston within said piston-chamber, acradle-Valve within said cradle-valve chamber adapted to govern theports in said grating and provided with means adapted to engage saidpiston, substantially as described.

3. In a back-pressure Valve, the combination with a casing containing achamber open at the top and bottom and divided by a partition havingports formed therein, and a closed chamber communicating with the firstsaid chamber through ports formed in their walls, of a piston positionedwithin said closed chamber, a valve positioned within the first saidchamber and adapted to govern the ports in said partition and providedwith means adapted to engage the piston in said closed chamber,substantially as described.

In testimony whereof I hereunto aifix my signature in presence of twowitnesses.

HENRY J. WESSINGER.

Witnesses:

S. S. RUMsEY, JosErH B. Cor'roN.

